Molecular addition compounds of manganese nitrate, urea, and water



Patented Jan. 1, 1935 MOLECULAR ADDITION COIVIPOUNDS MANGANESE NITRATE, UREA, AND WATER Ernest R. Boller, Cleveland; Heights, Ohio, assignor to The Grasselli Chemical Company, Cleveland, Ohio, a corporation of Delaware No Drawing. Application July 8, 1933, Serial No. 679,583

3 Claims. (01. 260-11) The present invention relates to a new comthe'range of compositions of X from 1-5 to 2. position of matter consisting of molecular addiand Y from 3 to 5.

tion compounds of manganese nitrate hydrates Materials within these ranges do not soften and urea. appreciably at temperatures up to 40 0.; they 5 Manganese nitrate crystallizes with 6 or with are under ordinary circumstances practically 5 3 mols of water of crystallization, the melting non-hygroscopic and easily watersoluble. They points of these two hydrates being 25.8 C. for can be mixed with other materialssuch as manthe hexahydrate and 355 C. for the trihydrate. ganese-phosphates, alkali metal nitrates, etc. Thus in warm summer weather these compounds without losing their own properties.

10 melt in their own water of crystallizationwhich In preparing my novel compounds I prepare makes it exceedingly diificult and costlyto han-. a melt of manganese nitrate hydrate of the dle and ship these materials. desired water content between 3 and 6 mols In addition, the hydrates of manganese ni- H2O per mol of Mn(NO3)2. vI heat this to' about trate are very hygroscopic. This further in- 50 to 75 C. and stir into the melt the desired creases the difficulty ofhandling these materiamount of urea. Higher temperatures are pref- 5 als. In preparing compositions. containing manerably avoided to prevent undue hydrolysis or ganese nitrate, it is usually necessary to mix in other reactions. This solution is then cooled to the manganese nitrate as soon asit is crystalabout room temperature, the crystal magma lized and then seal theproduct in air-tight conbeing stirred as long as possible. The magma U 2o tainers immediately. 1 eventually sets to a hard, solid mass, the time v Furthermore, it is rather difflcult'to crystallize required depending upon the rate of heat transmanganese nitrate. It is the present practice fer. The solid mass is then broken up and. is to prepare a manganese nitrate solution of highready for packaging and use.

est practical concentration and then solidity In the following I am giving specific examples 5 this by rather strenuous refrigeration. Thisis a 01' the preparation of manganese nitrate hytroublesome and expensive operation. drate-urea compounds within the scope of my I have found that. the manganese nitrate invention. v

hydrates form definite addition compounds or Example 1.2270 gms. manganesenitrate crysdouble compounds with urea which have a 'subtals containing 4.7 mols Water per mol manganese Stantially higher melting point than the individnitrate were heated to 75 C. and 780 gms. urea, 30

. ual manganese nitrate hydrates or their mix- 1.5 mols urea per mol manganese nitrate,.were V tures, and which are far less hygroscopic than dissolved therein. The solution was solidified, the manganese n a e y ates. with constant stirring, in a cold Water bath. The

These addition compounds are produced by solid product obtained did not soften appreciadding urea to melts of the manganese nitrate ably when held at C. for two hours, and was 35 hydrates and cooling the mixtures to effect only slightly hygroscopic. V

solidification. Example 2.- 1930 gms. manganese nitrate solu- The amounts of urea which can be added in tion containing 5 H1015 Water 1 11101 manganese this manner'to manganese nitrate hydrates to nitrate Were heated and 860 gTnS- e form solid products of higher. melting points 2 1 1 11101 manganese nitrate, were dissolved. 40

- than the nitrates do n t necessarily f ngw therein. The solution was solidified, with constocchiometric proportions. Within reasonable $133111? Stirring, y Cooling in a Water bat The limits the stability and non-hygroscopicity of product obtained did n soften when e d at the solid addition compound is directly proporfor tWO hOuTSi BXPOSUIB to a o i tional to the amount of urea and inversely several s this product s ot l -de proportional to the amount of water in the q c t but Slightly efilorescentproduct. I I 1 In. view of the high melting point of my novel Compositions of very useful properties have compounds and the innocuous character of the corresponding to the formula, in most cases be substituted for the manganese nitrate hydrates used in the chemical industry, Q thus avoiding the uneconomical handling difii- I in which X is from 1 to 3 and}! from 3 to 6 culties encountered with the straight manganese been prepared within the range of compositions urea contained therein, 1 foundthat they can and preferred compositions will be found within nitrate hydrates. 55 t I claim:

1. As a new composition of matter a crystalline manganese nitrate hydrate-urea compound having a melting point not below 40 C.

'2, As a new composition of matter a crystalline manganese nitrate, water andurea com-' pound :in which the 3 ingredients are present in the molecular proportion of 1Mn(NO3)2, from 3 tot H20 and from 1 to 3 CO(NH2)'2.

3. As a new composition of matter a crystalline manganese nitrate, water and urea compound in which the 3 ingredients are present in the molecular proportion of 1Mn(NO3)2, from 3 to 5 H20 and from 1.5 to 2 CO(NH2)2.

ERNEST R. BOLLER. 

